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MSP430F2132 10位AD采样不准

Other Parts Discussed in Thread: MSP430F2132

        请教大家一个问题,正在生产的一批产品中(主控为msp430f2132),AD采样的值差别较大,量AD口上的电压相差很小,用的是内部参考电压1.5v,把内部电压

输出发现内部参考电压相差也不大,一个为1.494v,一个为1.496v,更改寄存器采样保持时间的值会影响采样值,不知是什么原因,请各位解答,谢过先!